Khare and Sukhatme [1]}, [2]} have found solutions for these
cases by integrating the Schrödinger equation directly.
Here, the solutions are obtained from the expansions in series of \(\mathrm {cn}^2u\)  (\(\mathring{\mathbf {\Psi }}^{(i)}\)  and \(\tilde{\mathbf {\Psi }}^{(i)}\)  written in
Section 5.2); these satisfy the Arscott condition for series with two or more terms, in opposition to \(\mathring{\psi }^{(i)}\)  and \(\tilde{\psi }^{(i)}\) .
